Description: Synergistic Effects of ELMs and Steady State H and H/He Irradiation on Tungsten

This title appears in the Scientific Report : 2015

Synergistic Effects of ELMs and Steady State H and H/He Irradiation on Tungsten

To investigate synergistic effects of high heat flux loading on H and H/He loaded tungsten surfaces, specimens were exposed to a 30 keV steady-state H or H/He beam and subsequently loaded with an electron beam to simulate ELMs. The heat flux during the H and H/He loading was 10.5 MW m−2, while a 2 ×...

Personal Name(s):	Lemahieu, Nathan (Corresponding author)
	Greuner, Henri / Linke, Jochen / Maier, Hans / Pintsuk, Gerald / Van Oost, Guido / Wirtz, Marius
Contributing Institute:	Werkstoffstruktur und -eigenschaften; IEK-2 Plasmaphysik; IEK-4
Published in:	Fusion engineering and design, 98-99 (2015) S. 2020 - 2024
Imprint:	New York, NY [u.a.] Elsevier 2015
DOI:	10.1016/j.fusengdes.2015.06.051
Document Type:	Journal Article
Research Program:	Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Plasma-Wall-Interaction
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1016/j.fusengdes.2015.06.051 in citations.

To investigate synergistic effects of high heat flux loading on H and H/He loaded tungsten surfaces, specimens were exposed to a 30 keV steady-state H or H/He beam and subsequently loaded with an electron beam to simulate ELMs. The heat flux during the H and H/He loading was 10.5 MW m−2, while a 2 × 1025 m−2 fluence was reached. After exposure, all specimens exhibited an altered surface morphology. The H/He samples with a surface temperature of 1000 °C and 1500 °C had a multitude of surface extrusions. Afterwards the particle loaded samples were exposed to 100 ELM-like pulses around the material's damage threshold. Transient heat fluxes of 190 MW m−2 and 380 MW m−2 were applied at room temperature and 400 °C for a duration of 1 ms. Post-mortem analysis showed no deterioration of thermal shock resistance in comparison with polished material. For some tests the reference specimens roughened or cracked while the H or H/He exposed material had no damage. The H-content and the H/He-induced cavities and/or extrusions are suggested as two potential causes for this change in material behaviour.